| Name | CVE-2021-3638 |
| Description | An out-of-bounds memory access flaw was found in the ATI VGA device emulation of QEMU. This flaw occurs in the ati_2d_blt() routine while handling MMIO write operations when the guest provides invalid values for the destination display parameters. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-4980-1 |
| Debian Bugs | 992726 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| qemu (PTS) | buster | 1:3.1+dfsg-8+deb10u8 | fixed |
| buster (security) | 1:3.1+dfsg-8+deb10u10 | fixed |
| bullseye, bullseye (security) | 1:5.2+dfsg-11+deb11u2 | fixed |
| bookworm | 1:7.2+dfsg-7+deb12u1 | fixed |
| sid, trixie | 1:8.1.0+ds-6 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| qemu | source | stretch | (not affected) | | | |
| qemu | source | buster | (not affected) | | | |
| qemu | source | bullseye | 1:5.2+dfsg-11+deb11u1 | | DSA-4980-1 | |
| qemu | source | (unstable) | 1:6.1+dfsg-6 | | | 992726 |
Notes
[buster] - qemu <not-affected> (Vulnerable code introduced in ATI VGA device emulation added later)
[stretch] - qemu <not-affected> (Vulnerable code introduced in ATI VGA device emulation added later)
https://bugzilla.redhat.com/show_bug.cgi?id=1979858
https://lore.kernel.org/qemu-devel/CAA8xKjXkDwPYxSAeRb+2mfHRrbiL_kh9unVkemFXLfF68UXePA@mail.gmail.com
Introduced by: https://gitlab.com/qemu-project/qemu/-/commit/584acf34cb05f16e13a46d666196a7583d232616 (v4.1.0-rc0)
Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/205ccfd7a5ec86bd9a5678b8bd157562fc9a1643 (v7.2.0-rc0)